Why was george mcclellan important at this time of the civil war.

He built the most famous Union army of the war called the Army of the Potomac and he led the army to victory at the Battle of Antietam.

I'm not sure if this is what you are asking for

c]extended voting rights to african americans

john maynard keynes developed new economic theories in response to the : b) great depression of the 1930s. his theories are so important that they are known as "keynesianism". in his works he supports the idea of a government with deeper involvement and intervention to end the great depression.